Method of making light-edged pressed glassware.



PATENTED DEC. 18, 1906.

' F. WOGDRUFF.

NG LIG PLIOA'I'IO DG P ED GLASSWARB. E 13.28,

METHOD OF MAKI vw/W//// WIY TN 55858:

J HFIVENTOR I W Z 'W- M 1 being UNITED STATES PATENT iforrion FRANKWOODRUFF, OF TOLEDO, OHIO.

METHOD OF MAKING LlGHT-EDGED PRESSED GLASSWARE.

Specification of Letters Patent. Application fileii February 28, 1906.Serial No. 303,326.

Patented Dec. 18, 1906.

To all whom it may concern.-

Be it known that .I, FRANK Woonnurn, a citizen of the United States, anda resident of Toledo, in the county of Lucas and State of Ohio, haveinvented a certainnew and useful Method of Making Light Edged PressedGlassware; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it apper tains to make and use the same,reference had to the accompanying drawings, and to the letters ofreference marked thereon, which form a part of this specification.

- My invention relates to the manufacture of pressed glassware, andparticularly to the class of pressed glassware intended to be cut and onwhich it is desired to form a thin edgesuch, for instance, as goblets,tumblers, and similar articles of tableware.

In pressing a tumbler-blank for cutting pur oses the lastic glass isdropped into a mo (1 made 0 iron of the required interior shape andconfiguration and formed into shape by pressure. After the glass ispressed into the required shape it is attached to a long iece of iron,called a purity, and lace in a glory-hole or reheating-furnace. hisheating melts off all mold marks, re-

' moves the oxid of iron from the surface of the glass article, and alsomelts the outer skin ofthe glass, giving it a brilliant effect.

- This method of forming tumbler-blanks or the like for cutting purposesis perfectly satisfactory in the case of heavy-edged articles ofglassware, but has been found to be impractical in the manufacture oflight-edged articles of glassware, thus necessitating the manufacturingof such light-edged ware by I hand, which is the more expensive process.

In the pressing of a light-edged article of glass it is almostimpossible for the presser, unless he possess a high degree of skill, tohold the plunger in the mold the proper length of time to cause it toset perfectly therein and at the same time avoid a cracking or crazingof the light edge thereof, which cracking or 'crazing makes it anon-salable article.

' The object of my invention is to provide a new and improved method ofmanufacturing pressed articles of glassware having light edges wherebytoprevent the cracking or crazing of such light edges due to-the continuedpressure of the forming-plunger therein until the glass is perfectl set,and also to 'revent a melting of the light edge during t e reheating orfire-polishingprocess, and to cheapen the present costo manufacturethereof.

The invention is illustrated in the accom- 'panying drawings, in whichFigure 1 is an elevation, partlyinvertical section, of a tumbler-blankhaving it's'edge formed with a slight annular protuberance orenlargement as it appears when removed from the mold. Fig. 2 is asimilar view of a tumbler in finished state with the ance or heavy edgeground off. section of a ortion of a tumbler having the bulge formed onits edge by a slight flaring thereof, and Fi 4 is a vertical section ofa ortion of a mo d designed to form the tumler shown in Fig. 1.

In the carrying out of my process to produce a tumbler having a lightedge, as shown in Fig. 2, I employ a mold precisely the same in shape asone employed to form a heavyedged tumbler, exce t that the interior ofthe female mold mem l er A is formed with an annular recess, as shown ata in Fig. 4, which recess is disposed and shaped to form a adual orupwardly and outwardly tapered ead or projection circumferentially onthe upper edge of the tumbler, as shown at b in Fig. 1. The plunger ormale member B cooperating with the mold may either be formed adjacentrotuberig. 3 is a its upper edge with a slight annular bulge c r topress the interior rim of the tumbler into the shape shown at d in Figs.1 and 2, or it may be shaped to have a taper somewhat more decided thanthe interior taper of the mold, to effect in either instance adiminished thickness of the sides of the tumbler at the rim thereof,whereby to form a light or frail edge, as shown in Fig. 2, when the beador projection b is removed to form the finished article.

To form a tumbler having a light edge by the old method would produce anarticle done with a -glass;blank;li ke the one shown in Fig. 1, the@eflectis altogether different, for the reason that the ed e is a greatdeal heavier, and thereforereslsts the heat. untilthe blank isthoroughly fire-polished. The blank after heing fire-polished andannealed or. passed through the lehrs is taken to a grindlng-machine andthe bead or projection-b ground ofi, so that the outer sides of thetumler are perfectly straight, thus producing a blank with a neat lightedge which looks exactly'like a hand-made tumbler.

Bythe employment of my process it is a. parent that aconsiderable amountof t e skill required in the performance of the old process to press theblanks of ht-edged lassware is eliminated, as the e ge. belng eavierenables the presser to hold down on the article until it is set so itwill retain the exact form of the mold when removed after the pressingoperation without danger of cracking orcrazing its ed e. 7 It alsoenables the article to be thoroug y fire-finished or fireolished, whichis very important to the pro notion of a perfect article, as the blanksshould be fire-polished on the inside and outside, so as to absolutelyremove all oxid of iron which adheres to the glass from the plungeronthe inside and from the mold on the outside. p

In Fig. 3 the edgeofthe tumbler is shown as being'flared, as at e, toform the annular bulge or projection thereon. This flare may.

either be formed thereon during the pressi operation or by hand afterthe glass-blan comes from the mold. After this blank has been subjectedto the fire-polishing and annealing process the flared or projectingportion of the ed e is ground down substantially to the dotted .lineshown in said figure, or sufficiently to form a straight outer surfaceon the article.

It is obvious that my process applies to any and all blanks for llght-eded glassware that are intended to be cut an that thefigures intended tobe cut on the same may be cut in the mold whereb to partlyfinish thepressed blank, or the b ank may be pressed plain and the desired fi escut on it afterward, and also that t e protuberance or bulge may eitherbe pressed or formed thereon by hand.

, Having thus described-my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A method of manufacturi light-edge ressed glassware, consisting oforming the ight. edge of the glass-blank with. an annular bead orprojection, and grinding ofi" the bead or projection after thefire-polishing and annealing operations.

2. A method of manufacturing light-edged pressed glassware, consistingof forming the ight edge of the lass-blank with an annular protuberanceor ulge and permitting it to remain on the blank during the fire-poishing and annealing processes and then grinding it offto form a thinedge. 3. A method of manufacturing light-edged pressed glassware,consisting of forming a ulge or protuberance on the li ht edge of theglass-blank simultaneous wit the pressing of the blank and ermitting itto remain on the blank (lurk? t e-fire-fimshing process then grinding ito to form a light uniform edge, the said bulge or protuberance beingheaviest at its rim edge.

4. A method of manufacturing light-edged pressed glassware consisting offormin an annular projection on the hght edge 0 the glass-blank at thetime it is pressed, which prevents a cracking or crazing of the edge ofthe article duringt e pressing operation and removing such projectionafter the fire-finishing and annealing operations whereby to 'form thelight ed e. i

5. A method 0 manufacturing light-edged pressed lassware to be cutconslstin of providing t e female mold member witl i an annular recesspositioned to form a bulge or enlargement at the rim of thearticle-blank, forming a glass-b ank therein then reheating the blank tothorou 'y fire-polish it, then annealing it, and fina ly grinding thebulge or enlar ement from the rim of the blank, substantlally asdescribed.

In witness whereof I have hereunto signed my name to this specificationin the presence of two subscribing witnesses.

FRANK WOODRUFF.

A Witnesses:

C. W. OWEN,

CEciLm M. FRANK.

